How to modify capabilities shown in the field "Only visible to..." dropdown - GravityKit/GravityView GitHub Wiki
GravityView only shows a few roles by default. If you want to add more, here's how:
add_filter( 'gravityview_field_visibility_caps', 'modify_gravityview_field_visibility_caps');
function modify_gravityview_field_visibility_caps($caps) {
// Add your capabilities here.
$caps[] = array(
'label' => 'Edit Dashboard',
'value' => 'edit_dashboard'
);
return $caps;
}